1 files changed, 63 insertions, 0 deletions
diff --git a/lib/private/Preview/Watcher.php b/lib/private/Preview/Watcher.php
new file mode 100644
index 00000000000..21f040d8342
--- /dev/null
+++ b/lib/private/Preview/Watcher.php
@@ -0,0 +1,63 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OC\Preview;
+
+use OCP\Files\FileInfo;
+use OCP\Files\Folder;
+use OCP\Files\IAppData;
+use OCP\Files\Node;
+use OCP\Files\NotFoundException;
+
+/**
+ * Class Watcher
+ *
+ * @package OC\Preview
+ *
+ * Class that will watch filesystem activity and remove previews as needed.
+ */
+class Watcher {
+	/** @var IAppData */
+	private $appData;
+
+	/**
+	 * Watcher constructor.
+	 *
+	 * @param IAppData $appData
+	 */
+	public function __construct(IAppData $appData) {
+		$this->appData = $appData;
+	}
+
+	public function postWrite(Node $node) {
+		$this->deleteNode($node);
+	}
+
+	protected function deleteNode(FileInfo $node) {
+		// We only handle files
+		if ($node instanceof Folder) {
+			return;
+		}
+
+		try {
+			if (is_null($node->getId())) {
+				return;
+			}
+			$folder = $this->appData->getFolder((string)$node->getId());
+			$folder->delete();
+		} catch (NotFoundException $e) {
+			//Nothing to do
+		}
+	}
+
+	public function versionRollback(array $data) {
+		if (isset($data['node'])) {
+			$this->deleteNode($data['node']);
+		}
+	}
+}